Advanced Electric Power Conversion Laboratory

Name: Minfan Fu


School of Info. Science and Tech.

ShanghaiTech University

Room 202C, SIST Building 2

393 Middle Huaxia Road

Pudong, Shanghai 201210

Tel: +86-021-20684455

Peng Zhao gives a talk on the seminar of CAPES.

The forth seminar of the Center for Advanced Power and Energy Systems (CAPES) was held on October 25, 2018. This is a monthly event   for the students of CAPES to share their research. On this seminar, Mr. Peng Zhao from AEPCL gave a talk titled as "Characteristics and Applications of Gallium Nitride Power Devices".


The future power conversion system not only must meet the characteristics demanded by the load, but also have to achieve high power density with high efficiency, high ambient temperature, and high reliability. Generally speaking, a high performance active device is the first force to push power density to meet the requirement of modern systems. Silicon has been a dominant material in power management since the late 1950s. However, due to continuous device optimizations and improvements in the production process, the material properties of silicon have increasingly become the limiting factor. The use of gallium nitride (GaN) devices is gathering momentum, with a number of recent market introductions for a wide range of applications. GaN devices have a much lower gate charge and lower output capacitance than silicon MOSFETs and, therefore, are capable of operating at a switching frequency 10 times greater. This can significantly impact the power density of power converters, their form factor, and even current design and manufacturing practices. To realize the benefits of GaN devices resulting from significantly higher operating frequencies, a number of issues have to be addressed, such as converter topology, soft-switching technique, modeling, packaging, and high frequency magnetics. This presentation will give a comprehensive review about the GaN device and its related issues as mentioned above. Finally, a series of GaN-based applications, such as POL, OBC, and PV inverter, will be briefly discussed.